In what should come as good news to heavy users on iPhone X, Twitterrific has added a new energy-saving “true black” theme, which now appears as an option alongside the existing dark theme.

The Theme panel has also been expanded in other ways, including support for avatar shapes – rounded rectangle, squircle, circle and square – improved font size selections, and bonus app icons that can be unlocked by using Twitterrific for Mac or the Tip Jar.

Building on a recently introduced feature in the latest version of the Mac app, Twitterrific for iOS now recognizes polls in feeds, indicated by a button at the bottom of a tweet.

Clicking the button opens the poll in an integrated mini-browser that users can then use to submit their vote. Users can also now tag their own tweets with #poll or use a graph or ballot box Emoji at the beginning or end, and the app will recognize them as such.

Elsewhere, a number of improvements to the app have been made across the board. Highlights include: Muffle rules that can now be deactivated without having to delete them, automatically deactivating themselves after 60 days of inactivity; unread tweet indicator dots; support for Dynamic Type; and timestamps for quoted tweets that now also respect the hidden thumbnail mode.

Twitterrific for iOS v5.18 is a free download on the App Store for iPhone and iPad. while Twitterrific 5.2 for Mac is $19.99 on the Mac App Store .

You can follow iPhoneFirmware.com on Twitter, add us to your circle on Google+ or like our Facebook page to keep yourself updated on all the latest from Apple and the Web.